O’Neal, a six-time NBA All-Star, had reached agreement on a contract two weeks ago.

Golden State is likely to use the 34-year-old O’Neal as a backup to Andrew Bogut. Festus Ezeli is working back from right knee surgery and is not expected to be ready to return for months.

O’Neal played in 55 games with four starts last season for the Phoenix Suns, averaging 8.3 points, 5.3 rebounds and 1.4 blocks in 18.7 minutes. The 6-foot-11 center is entering his 18th season in the NBA.